CN110262284B - Lithium battery pole piece rolling mill control method and system based on digital twinning technology - Google Patents
Lithium battery pole piece rolling mill control method and system based on digital twinning technology Download PDFInfo
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- CN110262284B CN110262284B CN201910547860.XA CN201910547860A CN110262284B CN 110262284 B CN110262284 B CN 110262284B CN 201910547860 A CN201910547860 A CN 201910547860A CN 110262284 B CN110262284 B CN 110262284B
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- H01M4/0435—Rolling or calendering
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- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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Abstract
The invention discloses a lithium battery pole piece rolling mill control method and a system based on a digital twinning technology. The control system comprises a control unit consisting of a main control system, an information collection module, a drive module and an information transmission module, and is realized in an embedded development board mode. The control method and the system predict the machining process in advance, further optimize the machining parameters, enable the actual machining result to meet the machining quality requirement, and change the current situation that the existing control method is too lagged.
Description
Technical Field
The invention belongs to the field of intelligent control of lithium battery pole piece rolling mill equipment, and particularly relates to a lithium battery pole piece rolling mill control method and system based on a digital twin technology.
Background
The digital twin is that the operation of physical entity equipment is fed back to the established virtual simulation model by establishing the virtual simulation model of the physical entity and combining the sensor information acquisition technology, so that the display and feedback of information such as behaviors, rules, strategies and the like of a real environment are completed, and the functions of full-life cycle system detection, process display, system optimization and the like of actual equipment are realized.
The lithium battery pole piece rolling mill is used as a key ring in the production of the lithium battery, the automation degree of the lithium battery pole piece rolling mill is higher and higher, and a control system is developing towards the direction of system precision, interconnection, product market globalization and production mode intellectualization.
In the control process of the existing lithium battery pole piece rolling mill equipment, a PLC (programmable logic controller) and an embedded technology are mainly used, and the equipment is mainly connected with various types of drivers, frequency converters, servo amplifiers, sensors and other external equipment through I/O (input/output) points, so that the overall control of the lithium battery pole piece rolling mill is realized. Although the method can control the pole piece rolling mill equipment to roll the lithium battery pole piece, the method also has the problems to be optimized: the information integration capability of the control system is weak, and the information acquisition capability of the control system on the equipment is limited; the feedback of the whole operation mode of the lithium battery pole piece rolling mill is lacked, and the improvement and optimization of a system control strategy are difficult to realize; and a fault prediction and analysis means is lacked, and the artificial observation and judgment are mostly relied on.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a lithium battery pole piece rolling mill control method and system based on a digital twinning technology. According to the control method, a digital twin virtual model of the lithium battery pole piece rolling mill is established, the association between a digital space and a physical space is realized through a novel rolling mill control system, the visualization degree of the rolling mill during operation can be effectively enhanced by means of the established digital twin, and the improvement of an actual control strategy and the prediction and diagnosis of a fault condition are promoted. The control system comprises a control unit consisting of a main control system, an information collection module, a drive module and an information transmission module, and is realized in an embedded development board mode.
The technical scheme for solving the technical problems is as follows: a control method of a lithium battery pole piece rolling mill based on a digital twinning technology is designed, and is characterized by comprising the following steps:
(1) constructing a virtual prototype of a lithium battery pole piece rolling mill on an upper computer, and performing primary simulation
Firstly, classifying control objects of the lithium battery pole piece rolling mill, and specifically dividing the control objects into a mechanical structure, a servo system, a driving assembly and an auxiliary component, thereby laying a foundation for establishing a model of the lithium battery pole piece rolling mill in a subsequent digital space; the mechanical structure part comprises a rolling mill unreeling device, a rolling mill reeling device, a rolling mill roller, a rolling mill housing and a rolling mill rail seat, and the rolling mill unreeling device, the rolling mill reeling device, the rolling mill roller, the rolling mill housing and the rolling mill rail seat form a main body part of the lithium battery pole piece rolling mill; the servo system is a closed-loop feedback system in the lithium battery pole piece rolling mill and is divided into a winding and unwinding tension system, a winding and unwinding deviation rectifying system and a gap adjusting system; the driving assembly is a controlled unit in the lithium battery pole piece rolling mill and comprises four parts, namely a servo motor, a magnetic powder brake, a frequency converter and a gas-liquid booster pump; meanwhile, the process of producing the pole piece by the lithium battery pole piece rolling mill also relates to a plurality of necessary auxiliary components, including a cutter platform, a hydraulic system, a winding and unwinding air expansion shaft, a guide roller and an auxiliary tape threading mechanism; according to the control object of the lithium battery pole piece rolling mill, analyzing and collecting mechanical structure parameters, and meanwhile, combining dynamics, a complex space environment and a mechanical structure of an actuating mechanism, completing the building of a main body model of the lithium battery pole piece rolling mill in a digital space in SolidWorks;
then, importing the main body model of the lithium battery pole piece rolling mill into ANSYS for simulation analysis, completing parameter setting on the established main body model of the lithium battery pole piece rolling mill in software by adding displacement, force, temperature and electromagnetic load which are the same as those of the actual lithium battery pole piece rolling mill in operation on the main body model of the lithium battery pole piece rolling mill, then performing structural dynamics, fatigue and structural optimization analysis on the established main body model of the lithium battery pole piece rolling mill, checking and analyzing the result obtained after processing, and judging whether the established main body model of the lithium battery pole piece rolling mill and the set parameters are usable or not; if the current data structure parameters are available, collecting the current data structure parameters, inputting the current data structure parameters into ADAMS for constructing a virtual prototype, if the current data structure parameters are unavailable, adjusting the model equipment parameters, collecting newly adjusted data structure parameters, building a main body model of the lithium battery pole piece rolling mill in the digital space again in SolidWorks, and repeating the steps; when the established lithium battery pole piece rolling mill main body model and various parameters are judged to be accurate and can be used for subsequent virtual prototype building, the model is led into ADAMS, then a winding and unwinding tension system, a winding and unwinding deviation correcting system and a gap adjusting system model are built on the basis of the lithium battery pole piece rolling mill main body model, namely a transmission mechanism between a rolling mill roller and a rolling mill unwinding device, a transmission mechanism between the rolling mill roller and a rolling mill winding device, a roll gap adjusting device and a deviation correcting device model are built, kinematic pair constraints are added on the rolling mill roller, a rotating shaft of the rolling mill unwinding device, a rotating shaft of the rolling mill winding device, guide shafts of two parts of the transmission mechanism, the roll gap adjusting device and a deviation correcting roller of the deviation correcting device, and drives are added on the rolling mill roller, the rotating shaft of the rolling mill unwinding device, the rotating shaft of the rolling mill winding device and the deviation, drawing the motion tracks of a rolling mill roller, a rotating shaft of a rolling mill unreeling device, a rotating shaft of a rolling mill reeling device, guide shafts of two parts of transmission mechanisms, a roll gap adjusting device between an upper rolling mill roller and a lower rolling mill roller and a deviation correcting roller of a deviation correcting device in the model, setting simulation time and simulation steps, performing preliminary motion simulation of the lithium battery pole piece rolling mill, observing whether accurate actions can be finished or not, analyzing according to actual virtual simulation conditions, optimizing the motion tracks, and adding new kinematic pair constraints until the construction of a virtual prototype of the lithium battery pole piece rolling mill is finished;
(2) parameter information of lithium battery pole piece rolling mill in normal operation is collected through a sensor
According to the change of the parameters of tension, gap, pressure, offset distance, speed, thickness and coil diameter of the corresponding position in the running process of the lithium battery pole piece rolling mill, a distributed sensor network is constructed, and various kinds of physical quantity information which changes when the lithium battery pole piece rolling mill equipment runs are collected through a distributed sensor so as to represent the state of a lithium battery pole piece rolling mill system. The method specifically comprises the following steps: collecting rotating speed and position information by using encoders in servo motors driving a rotating shaft of the rolling mill unwinding device and a rotating shaft of the rolling mill winding device, and obtaining the winding diameters of the rolling mill winding device and the rolling mill unwinding device; placing a deviation-correcting sensor at the edge of a lithium battery pole piece, and measuring the offset distance generated by the pole piece when a lithium battery pole piece rolling mill runs; measuring the thickness of the pole piece before and after rolling by using a thickness measuring sensor; tension sensors are arranged between a rolling mill roller and a rolling mill unwinding device, and between the rolling mill roller and a rolling mill winding device, and tension conditions of pole piece belts among the rolling mill unwinding device, the rolling mill winding device and the rolling mill roller are measured; meanwhile, collecting the information of the rotating speed and the position according to encoders in servo motors in the rolling mill roller and the roller gap adjusting device to obtain the information of the rolling mill roller gap parameters; placing a plurality of pressure sensors between a rolling mill roller and a rolling mill unwinding device and between the rolling mill roller and a rolling mill winding device, and measuring pressure parameters of a pole piece on a rotating shaft of the rolling mill unwinding device and a rotating shaft of the rolling mill winding device in the middle transmission process; collecting rotation speed and position information according to a rolling mill roller, a rotating shaft of a rolling mill unreeling device, a rotating shaft of a rolling mill reeling device, a deviation correcting roller of a deviation correcting device and an encoder in a servo motor of a roll gap adjusting device, and further obtaining the running speed of a pole piece belt; meanwhile, according to the parameter information acquired or inferred by the parts, the rolling pressure parameter of the rolling mill roller is obtained;
(3) interconnection of virtual prototype of lithium battery pole piece rolling mill and lithium battery pole piece rolling mill entity
The upper computer is connected with the information collection module, the information collection module is connected with the sensor in the step (2) through an interface, the upper computer receives the tension, gap, pressure, offset distance, speed, thickness and coil diameter parameter information of the corresponding position of the lithium battery pole piece rolling mill, which is collected by the sensor, through the information collection module, the parameter information is transmitted to ADAMS by means of MATLAB, data interaction is completed with a virtual prototype of the lithium battery pole piece rolling mill constructed in ADAMS, and a model structure corresponding to the lithium battery pole piece rolling mill entity is bound with the parameter information collected from the part of entity; when the lithium battery pole piece rolling mill actually operates, the sensor continuously collects parameter information and feeds the parameter information back to the upper computer, so that the binding parameter information of the model structure is continuously updated, the model of the lithium battery pole piece rolling mill is driven to continuously move, and the virtual prototype of the lithium battery pole piece rolling mill and the entity of the lithium battery pole piece rolling mill are interconnected;
(4) feedback control lithium battery pole piece rolling mill and fault early warning
When the lithium battery pole piece rolling mill model continuously moves, observing the operation condition of the lithium battery pole piece rolling mill through a simulation platform in ADAMS of an upper computer, dynamically comparing and analyzing the entity of the lithium battery pole piece rolling mill and a virtual prototype of the lithium battery pole piece rolling mill, evaluating and optimizing the control strategy and the operation condition of the lithium battery pole piece rolling mill by the upper computer according to the virtual working condition information and the parameter information acquired by a sensor, and sending information needing to be changed to a main control system; the main control system changes the method and parameters in the main control system software according to the received data, and then drives the driving module to realize the regulation and control of the lithium battery pole piece rolling mill entity; by analyzing the stability of the operation of the lithium battery pole piece rolling mill entity on the simulation platform in the ADAMS and the collected operation parameters, the fault prediction of the lithium battery pole piece rolling mill is carried out on the upper computer, and possible faults are avoided.
Furthermore, an intelligent control system of a lithium battery pole piece rolling mill based on a digital twin technology is designed, and the control system is suitable for the control method and is characterized by comprising an upper computer, a sensor, a main control system, an information collection module, a driving module and an information transmission module; the information collection module is connected with the sensor through an interface, receives the parameters of tension, gap, pressure, offset distance, speed, thickness and roll diameter collected by the sensor, collects and stores the data of the sensor, and simultaneously can transmit the data to a master control system through the module or an upper computer through the information transmission module;
the sensors comprise a deviation-correcting sensor, a thickness measuring sensor, a tension sensor, a pressure sensor and an encoder, wherein the deviation-correcting sensor and the thickness measuring sensor are arranged at the edge of the lithium battery pole piece, the tension sensor is arranged at a position between a rolling mill roller and a rolling mill unwinding device, and between the rolling mill roller and the rolling mill winding device, and the encoder is arranged in a servo motor connected with the rolling mill roller, a rotating shaft of the rolling mill unwinding device, a rotating shaft of the rolling mill winding device, a deviation-correcting roller of the deviation-correcting device and a roller gap adjusting.
The driving module is connected with a servo motor and a frequency converter which are driven by each part of the lithium battery pole piece rolling mill, receives signals from a master control system, and completes the control of the rotating speed, the direction and the distance of the servo motor, thereby realizing the control of rolling speed, the control of winding and unwinding tension, the control of rolling pressure, the adjustment of gaps, the control of opening and closing of discharge and the control of winding and unwinding deviation correction;
the information transmission module is connected with the upper computer, the main control system and the information collection module, and the module completes data transmission in a data line connection mode and a wireless wifi mode and is used for information transmission and interaction; the information transmission module can be connected with the information collection module, and the information of each sensor collected by the information collection module is transmitted to the upper computer through the information transmission module for analysis by the upper computer; meanwhile, the data transmission between the master control system and the upper computer can be completed by the module, so that the information transmission efficiency is improved;
the master control system can receive the sensor data acquired by the information acquisition module and transmit the sensor data to the upper computer, and can also complete information transmission and interaction with the upper computer through the data transmission module; the master control system is connected with the driving module, and the motor control of the driving module is completed by transmitting the control information to the driving module; meanwhile, the control system and a virtual prototype of the lithium battery pole piece rolling mill established in the upper computer complete information interaction, when the control strategy needs to be optimized through the virtual prototype in the upper computer or part of parameters in the control scheme of the lithium battery pole piece rolling mill are changed, the upper computer sends the information needing to be changed to the main control system in a mode of directly connecting the data lines or by means of an information transmission module, and the main control system changes the method and parameters in the software design of the main control system according to the received data so as to drive the driving module to realize the regulation and control of the lithium battery pole piece rolling mill entity;
the upper computer operates the virtual prototype of the lithium battery pole piece rolling mill and processes the parameter information collected by the sensor; the upper computer receives the tension, gap, pressure, offset distance, speed, thickness and coil diameter parameter information of the corresponding position of the lithium battery pole piece rolling mill acquired by the sensor, transmits the parameter information to ADAMS by means of MATLAB, completes data interaction with a virtual prototype of the lithium battery pole piece rolling mill constructed in the ADAMS, binds the model structure corresponding to the lithium battery pole piece rolling mill entity with the parameter information acquired from the part of entity, and continuously acquires the parameter information and feeds the parameter information back to the upper computer when the lithium battery pole piece rolling mill actually runs, so that the continuous update of the binding parameter information of the model structure is realized, the lithium battery pole piece rolling mill model is driven to continuously move, and the interconnection of the virtual prototype of the lithium battery pole piece rolling mill and the lithium battery pole piece rolling mill entity is realized;
an ADAMS simulation platform is arranged in the upper computer, the operation condition of the lithium battery pole piece rolling mill is observed through the ADAMS simulation platform, virtual operation condition information is collected, the lithium battery pole piece rolling mill entity and a virtual prototype of the lithium battery pole piece rolling mill are subjected to dynamic comparative analysis, the control strategy and the operation condition of the lithium battery pole piece rolling mill are evaluated and optimized by the upper computer in combination with the virtual condition information and parameter information collected by a sensor, and information needing to be changed is sent to a main control system; the main control system changes the method and parameters in the main control system software according to the received data, and then drives the driving module to realize the regulation and control of the lithium battery pole piece rolling mill entity; through analyzing the stability of the operation of the lithium battery pole piece rolling mill on the ADAMS simulation platform and the collected operation parameters, the fault prediction of the lithium battery pole piece rolling mill is carried out on the upper computer, and possible faults are avoided.
Compared with the prior art, the invention has the beneficial effects that:
(1) the visualization degree of the lithium battery pole piece rolling mill is improved, and the actual operation condition of the rolling mill can be observed on a virtual platform;
(2) the machining process is predicted in advance, so that machining parameters are optimized, the actual machining result meets the machining quality requirement, and the situation that the existing control method is too lagged is changed;
(3) the optimization of the control method of the remote rolling mill equipment is realized through the virtual simulation platform, and the control method can be directly improved through a digital twin body;
(4) and monitoring interference factors influencing the quality of the lithium battery pole piece in the rolling process, and eliminating the influence of the disturbance on the manufacturing process in time.
(5) By analyzing the running stability of the rolling mill on the rolling mill entity and the ADAMS simulation platform and combining the rolling mill running parameters collected in real time, the fault of the rolling mill can be found or predicted in time, and the loss caused by the fault of the rolling mill is avoided.
Drawings
FIG. 1 is a schematic flow chart of an embodiment of a control method of the present invention;
FIG. 2 is a flow chart of a main body model construction of a lithium battery pole piece rolling mill according to an embodiment of the control method of the invention;
FIG. 3 is a schematic diagram illustrating control object classification of a lithium battery pole piece rolling mill according to an embodiment of the control method of the present invention;
FIG. 4 is a control schematic block diagram of one embodiment of a control system of the present invention;
fig. 5 is a flow chart of evaluation and optimization of an operation process of a lithium battery pole piece rolling mill according to an embodiment of the control method of the present invention.
Detailed Description
The control system design scheme of the present invention is further described below with reference to the accompanying drawings and embodiments.
The invention provides a lithium battery pole piece rolling mill control method (a control method for short, see figure 1) based on a digital twin technology, which comprises the following steps:
(1) constructing a virtual prototype of a lithium battery pole piece rolling mill on an upper computer, and performing primary simulation
Firstly, control objects of the lithium battery pole piece rolling mill are classified, and the control objects are specifically divided into a mechanical structure, a servo system, a driving assembly and an auxiliary component, so that a foundation is laid for the model establishment of the lithium battery pole piece rolling mill in the subsequent digital space. The mechanical structure part comprises a rolling mill unreeling device, a rolling mill reeling device, a rolling mill roller, a rolling mill housing and a rolling mill rail seat, and the rolling mill unreeling device, the rolling mill reeling device, the rolling mill roller, the rolling mill housing and the rolling mill rail seat form a main body part of the lithium battery pole piece rolling mill; the servo system is a closed-loop feedback system in the lithium battery pole piece rolling mill and is divided into a winding and unwinding tension system, a winding and unwinding deviation rectifying system and a gap adjusting system; the driving assembly is a controlled unit in the lithium battery pole piece rolling mill and comprises four parts, namely a servo motor, a magnetic powder brake, a frequency converter and a gas-liquid booster pump; meanwhile, the process of producing the pole piece by the lithium battery pole piece rolling mill also relates to some necessary auxiliary components, including a cutter platform, a hydraulic system, a winding and unwinding air expansion shaft, a guide roller and an auxiliary tape threading mechanism. According to the control object of the lithium battery pole piece rolling mill, mechanical structure parameters are analyzed and collected, and meanwhile, the building of a digital-space lithium battery pole piece rolling mill main body model is completed in SolidWorks by combining dynamics, a complex space environment and a mechanical structure of an actuating mechanism.
Then, importing the main body model of the lithium battery pole piece rolling mill into ANSYS for simulation analysis, completing parameter setting on the established main body model of the lithium battery pole piece rolling mill in software by adding displacement, force, temperature and electromagnetic load which are the same as those of the actual lithium battery pole piece rolling mill in operation on the main body model of the lithium battery pole piece rolling mill, then performing structural dynamics, fatigue and structural optimization analysis on the established main body model of the lithium battery pole piece rolling mill, checking and analyzing the result obtained after processing, and judging whether the established main body model of the lithium battery pole piece rolling mill and the set parameters are usable or not; and if the current data structure parameters are available, collecting the current data structure parameters, inputting the current data structure parameters into ADAMS for constructing a virtual prototype, if the current data structure parameters are unavailable, adjusting the model equipment parameters, collecting newly adjusted data structure parameters, building a main body model of the lithium battery pole piece rolling mill in the digital space again in SolidWorks, and repeating the steps. When the established main body model of the lithium battery pole piece rolling mill and various parameters are accurate and can be used for subsequent virtual prototype building, the main body model of the lithium battery pole piece rolling mill and the parameters are judged to be accurate, the main body model of the lithium battery pole piece rolling mill is led into ADAMS, then a winding and unwinding tension system, a winding and unwinding deviation correcting system and a clearance adjusting system model are built on the basis of the main body model of the lithium battery pole piece rolling mill, namely a transmission mechanism between a rolling mill roller and a rolling mill unwinding device, a transmission mechanism between the rolling mill roller and a rolling mill winding device, a roll gap adjusting device and a deviation correcting device model are built, and kinematic pair constraints are added on guide shafts, the roll gap adjusting device and deviation correcting rollers of the rolling mill roller, the transmission mechanism between the rolling mill roller and the rolling mill unwinding device, the transmission mechanism between the rolling mill roller and the rolling mill winding device and, meanwhile, a drive is added on a rolling mill roller, a rotating shaft of a rolling mill unreeling device, a rotating shaft of a rolling mill reeling device and a deviation correcting roller of a deviation correcting device, the motion tracks of the rolling mill roller, the rotating shaft of the rolling mill unreeling device, the rotating shaft of the rolling mill reeling device, guide shafts of two parts of transmission mechanisms, a roll gap adjusting device between an upper rolling mill roller and a lower rolling mill roller and the deviation correcting roller of the deviation correcting device in a model are drawn, then simulation time and simulation steps are set, preliminary motion simulation of the lithium battery pole piece rolling mill is carried out, whether accurate actions can be completed or not is observed, the motion tracks are optimized according to the analysis of the actual virtual simulation condition, new motion pair constraints are added until the construction of a virtual prototype of the lithium battery pole.
When virtual prototypes of each part are established, namely a rolling mill roller virtual prototype, a rolling mill unwinding device virtual prototype, a rolling mill winding device virtual prototype, a roll gap adjusting device virtual prototype, a deviation correcting device virtual prototype and a transmission mechanism (two-part transmission mechanism) virtual prototype, accurate analysis is carried out on the aspects of a mechanical kinematic equation and a mechanical kinematic equation according to the functional description of a lithium battery pole piece rolling mechanism system and the mechanical professional functional description, and the established virtual prototype is ensured to meet the running time constraint, the action space constraint and the available resource constraint of the lithium battery pole piece rolling mill during actual running.
(2) Parameter information of lithium battery pole piece rolling mill in normal operation is collected through a sensor
According to the change of the parameters of tension, gap, pressure, offset distance, speed, thickness and coil diameter of the corresponding position in the running process of the lithium battery pole piece rolling mill, a distributed sensor network is constructed, and various kinds of physical quantity information which changes when the lithium battery pole piece rolling mill equipment runs are collected through a distributed sensor so as to represent the state of a lithium battery pole piece rolling mill system. The method specifically comprises the following steps: collecting rotating speed and position information by using encoders in servo motors driving a rotating shaft of the rolling mill unwinding device and a rotating shaft of the rolling mill winding device, and obtaining the winding diameters of the rolling mill winding device and the rolling mill unwinding device; placing a deviation-correcting sensor at the edge of a lithium battery pole piece, and measuring the offset distance generated by the pole piece when a lithium battery pole piece rolling mill runs; measuring the thickness of the pole piece before and after rolling by using a thickness measuring sensor; tension sensors are arranged between a rolling mill roller and a rolling mill unwinding device, and between the rolling mill roller and a rolling mill winding device, and tension conditions of pole piece belts among the rolling mill unwinding device, the rolling mill winding device and the rolling mill roller are measured; meanwhile, collecting the information of the rotating speed and the position according to encoders in servo motors in the rolling mill roller and the roller gap adjusting device to obtain the information of the rolling mill roller gap parameters; placing a plurality of pressure sensors between a rolling mill roller and a rolling mill unwinding device and between the rolling mill roller and a rolling mill winding device, and measuring pressure parameters of a pole piece on a rotating shaft of the rolling mill unwinding device and a rotating shaft of the rolling mill winding device in the middle transmission process; collecting rotation speed and position information according to a rolling mill roller, a rotating shaft of a rolling mill unreeling device, a rotating shaft of a rolling mill reeling device, a deviation correcting roller of a deviation correcting device and an encoder in a servo motor of a roll gap adjusting device, and further obtaining the running speed of a pole piece belt; meanwhile, according to the parameter information acquired or inferred by the parts, the rolling pressure parameter of the rolling mill roller is obtained;
(3) interconnection of virtual prototype of lithium battery pole piece rolling mill and lithium battery pole piece rolling mill entity
The upper computer is connected with the information collection module, the information collection module is connected with the sensor in the step (2) through an interface, the upper computer receives the tension, gap, pressure, offset distance, speed, thickness and coil diameter parameter information of the corresponding position of the lithium battery pole piece rolling mill, which is collected by the sensor, through the information collection module, the parameter information is transmitted to ADAMS by means of MATLAB, data interaction is completed with a virtual prototype of the lithium battery pole piece rolling mill constructed in ADAMS, and a model structure corresponding to the lithium battery pole piece rolling mill entity is bound with the parameter information collected from the part of entity; when the lithium battery pole piece rolling mill actually operates, the sensor continuously collects parameter information and feeds the parameter information back to the upper computer, and the binding parameter information of the model structure is continuously updated, so that the model of the lithium battery pole piece rolling mill is driven to continuously move, and the virtual prototype of the lithium battery pole piece rolling mill and the entity of the lithium battery pole piece rolling mill are interconnected.
(4) Feedback control lithium battery pole piece rolling mill and fault early warning
When the lithium battery pole piece rolling mill model continuously moves, the running condition of the lithium battery pole piece rolling mill is observed through a simulation platform in ADAMS of an upper computer, the lithium battery pole piece rolling mill entity and a virtual prototype of the lithium battery pole piece rolling mill are subjected to dynamic comparative analysis, the upper computer evaluates and optimizes the control strategy and the running condition of the lithium battery pole piece rolling mill by combining virtual working condition information and parameter information acquired by a sensor, and information needing to be changed is sent to a main control system. And the master control system changes the method and parameters in the master control system software according to the received data, and further drives the driving module to realize the regulation and control of the lithium battery pole piece rolling mill entity. By analyzing the stability of the operation of the lithium battery pole piece rolling mill entity on the simulation platform in the ADAMS and the collected operation parameters, the fault prediction of the lithium battery pole piece rolling mill is carried out on the upper computer, and possible faults are avoided.
When the operation process of the lithium battery pole piece rolling mill is evaluated and optimized, the control strategy and the operation condition of the lithium battery pole piece rolling mill can be evaluated and optimized from three aspects of lithium battery rolling mill operation state evaluation, lithium battery pole piece production condition evaluation, rolling mill control process and parameter improvement by evaluating the interaction and the operation condition of a pole piece rolling mill physical entity (namely, the lithium battery pole piece rolling mill) and a digital twin virtual entity (namely, a virtual prototype of the lithium battery pole piece rolling mill) (see fig. 5). Firstly, evaluating a rolling process route, rolling process parameters and rolling process interference factors to obtain the overall operation state of the lithium electric rolling machine; then, obtaining the production condition of the lithium electrode plate from three aspects of pole piece rolling mill operation stability evaluation, pole piece rolling mill fault prediction and evaluation and pole piece rolling efficiency precision evaluation; and finally, through the evaluation, analyzing and improving the control process and parameters of the rolling mill, mainly modifying part of parameters in the control strategy, optimizing the control strategy and the rolling process of the rolling mill, eliminating interference factors influencing the rolling quality, and finally completing the evaluation and optimization of the operation process of the lithium battery pole piece rolling mill. And the optimization result is transmitted to a master control system in a data form through an upper computer, and the whole control strategy of the lithium battery pole piece rolling mill or part of parameter information in the lithium battery pole piece rolling mill is modified.
Further, the invention provides an intelligent control system (control system for short) of a lithium battery pole piece rolling mill based on a digital twin technology, which comprises an upper computer, a sensor, a master control system, an information collection module, a driving module and an information transmission module; the information collection module is connected with the sensor through an interface, receives the parameters of tension, gap, pressure, offset distance, speed, thickness and roll diameter collected by the sensor, collects and stores the data of the sensor, and simultaneously can transmit the data to a master control system through the module or an upper computer through the information transmission module;
the sensors comprise a deviation-correcting sensor, a thickness measuring sensor, a tension sensor, a pressure sensor and an encoder, wherein the deviation-correcting sensor and the thickness measuring sensor are arranged at the edge of the lithium battery pole piece, the tension sensor is arranged at a position between a rolling mill roller and a rolling mill unwinding device, and between the rolling mill roller and the rolling mill winding device, and the encoder is arranged in a servo motor connected with the rolling mill roller, a rotating shaft of the rolling mill unwinding device, a rotating shaft of the rolling mill winding device, a deviation-correcting roller of the deviation-correcting device and a roller gap adjusting.
The deviation rectifying sensor adopts a PS-C2 groove type deviation rectifying sensor; the thickness measuring sensor adopts a ZTMS08 type thickness measuring sensor; the tension sensor adopts a WLF type shaft penetrating type tension sensor; the pressure sensor adopts a Sbartot SBT760 type pressure sensor.
The driving module is connected with the servo motors and the frequency converters driven by all parts of the lithium battery pole piece rolling mill, receives signals from the master control system, and controls the rotating speed, the direction and the distance of the servo motors, so that the rolling speed control, the winding and unwinding tension control, the rolling pressure control, the gap adjustment, the discharge opening and closing control and the winding and unwinding deviation correction control are realized.
The information transmission module is connected with the upper computer, the master control system and the information collection module, and data transmission is completed by the module in a data line connection mode and a wireless wifi (wireless fidelity) mode and is used for information transmission and interaction. The information transmission module can be connected with the information collection module, and the information of each sensor collected by the information collection module is transmitted to the upper computer through the information transmission module for analysis by the upper computer; meanwhile, data transmission between the master control system and the upper computer can be completed by the module, and the information transmission efficiency is improved.
The master control system can receive the sensor data acquired by the information acquisition module and transmit the sensor data to the upper computer, and can also complete information transmission and interaction with the upper computer through the data transmission module. The master control system is connected with the driving module, and the motor control of the driving module is completed by transmitting the control information to the driving module. Meanwhile, the control system and a virtual prototype of the lithium battery pole piece rolling mill established in the upper computer complete information interaction, when the control strategy needs to be optimized through the virtual prototype in the upper computer or part of parameters in the control scheme of the lithium battery pole piece rolling mill are changed, the upper computer sends the information needing to be changed to the main control system in a mode of directly connecting the data lines or by means of an information transmission module, and the main control system changes the method and the parameters in the software design of the main control system according to the received data so as to drive the driving module to realize the regulation and control of the lithium battery pole piece rolling mill entity.
And the upper computer operates the virtual prototype of the lithium battery pole piece rolling mill and processes the parameter information collected by the sensor. The upper computer receives the tension, gap, pressure, offset distance, speed, thickness and coil diameter parameter information of the corresponding position of the lithium battery pole piece rolling mill acquired by the sensor, the parameter information is transmitted to ADAMS by means of MATLAB, data interaction is completed with a virtual prototype of the lithium battery pole piece rolling mill constructed in the ADAMS, a model structure corresponding to the lithium battery pole piece rolling mill entity is bound with the parameter information acquired from the part of entity, the sensor continuously acquires the parameter information and feeds the parameter information back to the upper computer when the lithium battery pole piece rolling mill actually runs, and continuous updating of the binding parameter information of the model structure is realized, so that the lithium battery pole piece rolling mill model is driven to continuously move, and the interconnection of the virtual prototype of the lithium battery pole piece rolling mill and the lithium battery pole piece rolling mill.
An ADAMS simulation platform is arranged in the upper computer, the operation condition of the lithium battery pole piece rolling mill is observed through the ADAMS simulation platform, virtual operation condition information is collected, the lithium battery pole piece rolling mill entity and a virtual prototype of the lithium battery pole piece rolling mill are subjected to dynamic comparative analysis, the upper computer evaluates and optimizes the control strategy and the operation condition of the lithium battery pole piece rolling mill by combining the virtual condition information and parameter information collected by a sensor, and information needing to be changed is sent to the main control system. And the master control system changes the method and parameters in the master control system software according to the received data, and further drives the driving module to realize the regulation and control of the lithium battery pole piece rolling mill entity. Through analyzing the stability of the operation of the lithium battery pole piece rolling mill on the ADAMS simulation platform and the collected operation parameters, the fault prediction of the lithium battery pole piece rolling mill is carried out on the upper computer, and possible faults are avoided.
The main control system, the information collection module, the driving module and the information transmission module form a control unit and are realized in an embedded development board mode.
The main control system takes an STM32F4 chip as a host chip and a main controller of each module. Data stored on an SRAM chip by an FPGA chip in the information collection module can be directly read out through an FSMC communication function of an STM32F4 chip; meanwhile, the transmission and feedback of control strategy information and motor running condition information are realized through an RS485 communication interface and a driving module; meanwhile, the master control chip communicates with the upper computer through the information transmission module, transmits the collected information to the upper computer in a wireless or CAN bus mode, and receives the information from the upper computer.
The information collection module uses an FPGA chip of XC3S400 model as a core, collects sensor information data through the FPGA chip, stores the sensor information data into an externally-hung SRAM chip, completes the collection of sensing information, reads out the data in the SRAM chip through the FPGA chip and transmits the sensing information to an upper computer by using an information transmission module, and simultaneously reads out the data on the SRAM chip directly through the FSMC communication function of an STM32F4 chip of a main control system, and transmits the sensing data to the upper computer through the STM32F4 chip of the main control system.
The driving module takes an STM32F4 chip as a core and communicates with the main control system in an RS485 mode to realize data and information interaction; the master control system transmits the control mode of the servo motor and the frequency converter in the lithium battery pole piece rolling mill to the STM32F4 chip of the driving module in an information mode through the RS485 communication interface, and then the driving module controls the servo driver and the frequency converter, so that the control of each module in the lithium battery pole piece rolling mill is realized, and meanwhile, the running condition of the servo motor can be fed back to the master control system through the RS485 communication interface.
The information transmission module adopts two modes of data line connection and wireless wifi to complete data transmission: the wireless part adopts a TCP/IP protocol, and transmits the collected sensing data information to an upper computer from a main control system by utilizing wireless; meanwhile, a communication interface is preset in the module, and data transmission is achieved through a CAN communication bus in a data line connection mode.
The invention relates to a lithium battery pole piece rolling mill control method and a system based on a digital twin technology, wherein a digital twin system of a lithium battery pole piece rolling mill is constructed, a virtual simulation platform of an upper computer is constructed, a lithium battery pole piece rolling mill control system is constructed, sensing network data are collected and transmitted to the virtual platform of the upper computer, a variable bound by a model is associated with a preset action, a parameter variable bound by the model is updated in real time by utilizing the collected data, the virtual action of the model is driven, the mapping of the real action of the rolling mill is realized, and the association of a digital space and a physical space of the rolling mill is completed; meanwhile, information is fed back to the control system through the upper computer, so that the control system reversely drives the real rolling mill to run according to the optimized parameters and the improved control strategy, and the intelligent degree of the whole debugging of the rolling mill is improved.
Nothing in this specification is said to apply to the prior art.
Claims (6)
1. A lithium battery pole piece rolling mill control method based on a digital twinning technology is characterized by comprising the following steps:
(1) constructing a virtual prototype of a lithium battery pole piece rolling mill on an upper computer, and performing primary simulation
Firstly, classifying control objects of the lithium battery pole piece rolling mill, and specifically dividing the control objects into a mechanical structure, a servo system, a driving assembly and an auxiliary component, thereby laying a foundation for establishing a model of the lithium battery pole piece rolling mill in a subsequent digital space; the mechanical structure part comprises a rolling mill unreeling device, a rolling mill reeling device, a rolling mill roller, a rolling mill housing and a rolling mill rail seat, and the rolling mill unreeling device, the rolling mill reeling device, the rolling mill roller, the rolling mill housing and the rolling mill rail seat form a main body part of the lithium battery pole piece rolling mill; the servo system is a closed-loop feedback system in the lithium battery pole piece rolling mill and is divided into a winding and unwinding tension system, a winding and unwinding deviation rectifying system and a gap adjusting system; the driving assembly is a controlled unit in the lithium battery pole piece rolling mill and comprises four parts, namely a servo motor, a magnetic powder brake, a frequency converter and a gas-liquid booster pump; meanwhile, the process of producing the pole piece by the lithium battery pole piece rolling mill also relates to a plurality of necessary auxiliary components, including a cutter platform, a hydraulic system, a winding and unwinding air expansion shaft, a guide roller and an auxiliary tape threading mechanism; according to the control object of the lithium battery pole piece rolling mill, analyzing and collecting mechanical structure parameters, and meanwhile, combining dynamics, a complex space environment and a mechanical structure of an actuating mechanism, completing the building of a main body model of the lithium battery pole piece rolling mill in a digital space in SolidWorks;
then, importing the main body model of the lithium battery pole piece rolling mill into ANSYS for simulation analysis, completing parameter setting on the established main body model of the lithium battery pole piece rolling mill in software by adding displacement, force, temperature and electromagnetic load which are the same as those of the actual lithium battery pole piece rolling mill in operation on the main body model of the lithium battery pole piece rolling mill, then performing structural dynamics, fatigue and structural optimization analysis on the established main body model of the lithium battery pole piece rolling mill, checking and analyzing the result obtained after processing, and judging whether the established main body model of the lithium battery pole piece rolling mill and the set parameters are usable or not; if the current data structure parameters are available, collecting the current data structure parameters, inputting the current data structure parameters into ADAMS for constructing a virtual prototype, if the current data structure parameters are unavailable, adjusting the model equipment parameters, collecting newly adjusted data structure parameters, building a main body model of the lithium battery pole piece rolling mill in the digital space again in SolidWorks, and repeating the steps; when the established lithium battery pole piece rolling mill main body model and various parameters are judged to be accurate and can be used for subsequent virtual prototype building, the model is led into ADAMS, then a winding and unwinding tension system, a winding and unwinding deviation correcting system and a gap adjusting system model are built on the basis of the lithium battery pole piece rolling mill main body model, namely a transmission mechanism between a rolling mill roller and a rolling mill unwinding device, a transmission mechanism between the rolling mill roller and a rolling mill winding device, a roll gap adjusting device and a deviation correcting device model are built, kinematic pair constraints are added on the rolling mill roller, a rotating shaft of the rolling mill unwinding device, a rotating shaft of the rolling mill winding device, guide shafts of two parts of the transmission mechanism, the roll gap adjusting device and a deviation correcting roller of the deviation correcting device, and drives are added on the rolling mill roller, the rotating shaft of the rolling mill unwinding device, the rotating shaft of the rolling mill winding device and the deviation, drawing the motion tracks of a rolling mill roller, a rotating shaft of a rolling mill unreeling device, a rotating shaft of a rolling mill reeling device, guide shafts of two parts of transmission mechanisms, a roll gap adjusting device between an upper rolling mill roller and a lower rolling mill roller and a deviation correcting roller of a deviation correcting device in the model, setting simulation time and simulation steps, performing preliminary motion simulation of the lithium battery pole piece rolling mill, observing whether accurate actions can be finished or not, analyzing according to actual virtual simulation conditions, optimizing the motion tracks, and adding new kinematic pair constraints until the construction of a virtual prototype of the lithium battery pole piece rolling mill is finished;
when virtual prototypes of each part are established, namely a rolling mill roller virtual prototype, a rolling mill unwinding device virtual prototype, a rolling mill winding device virtual prototype, a roll gap adjusting device virtual prototype, a deviation correcting device virtual prototype and two parts of transmission mechanism virtual prototypes, accurate analysis is carried out on the aspects of a mechanical kinematic equation and a mechanical kinematic equation according to the functional description of a lithium battery pole piece rolling mill mechanism and the mechanical professional functional description, and the established virtual prototype is ensured to meet the running time constraint, the action space constraint and the available resource constraint of the lithium battery pole piece rolling mill in actual running;
(2) parameter information of lithium battery pole piece rolling mill in normal operation is collected through a sensor
Constructing a distributed sensor network according to the changes of the parameters of tension, clearance, pressure, offset distance, speed, thickness and coil diameter of the corresponding position in the running process of the lithium battery pole piece rolling mill, and acquiring various kinds of physical quantity information which changes when the lithium battery pole piece rolling mill equipment runs through a distributed sensor so as to represent the system state of the lithium battery pole piece rolling mill; the method specifically comprises the following steps: collecting rotating speed and position information by using encoders in servo motors driving a rotating shaft of the rolling mill unwinding device and a rotating shaft of the rolling mill winding device, and obtaining the winding diameters of the rolling mill winding device and the rolling mill unwinding device; placing a deviation-correcting sensor at the edge of a lithium battery pole piece, and measuring the offset distance generated by the pole piece when a lithium battery pole piece rolling mill runs; measuring the thickness of the pole piece before and after rolling by using a thickness measuring sensor; tension sensors are arranged between a rolling mill roller and a rolling mill unwinding device, and between the rolling mill roller and a rolling mill winding device, and tension conditions of pole piece belts among the rolling mill unwinding device, the rolling mill winding device and the rolling mill roller are measured; meanwhile, collecting the information of the rotating speed and the position according to encoders in servo motors in the rolling mill roller and the roller gap adjusting device to obtain the information of the rolling mill roller gap parameters; placing a plurality of pressure sensors between a rolling mill roller and a rolling mill unwinding device and between the rolling mill roller and a rolling mill winding device, and measuring pressure parameters of a pole piece on a rotating shaft of the rolling mill unwinding device and a rotating shaft of the rolling mill winding device in the middle transmission process; collecting rotation speed and position information according to a rolling mill roller, a rotating shaft of a rolling mill unreeling device, a rotating shaft of a rolling mill reeling device, a deviation correcting roller of a deviation correcting device and an encoder in a servo motor of a roll gap adjusting device, and further obtaining the running speed of a pole piece belt; meanwhile, according to the parameter information acquired or inferred by the parts, the rolling pressure parameter of the rolling mill roller is obtained;
(3) interconnection of virtual prototype of lithium battery pole piece rolling mill and lithium battery pole piece rolling mill entity
The upper computer is connected with the information collection module, the information collection module is connected with the sensor in the step (2) through an interface, the upper computer receives the tension, gap, pressure, offset distance, speed, thickness and coil diameter parameter information of the corresponding position of the lithium battery pole piece rolling mill, which is collected by the sensor, through the information collection module, the parameter information is transmitted to ADAMS by means of MATLAB, data interaction is completed with a virtual prototype of the lithium battery pole piece rolling mill constructed in ADAMS, and a model structure corresponding to the lithium battery pole piece rolling mill entity is bound with the parameter information collected from the part of entity; when the lithium battery pole piece rolling mill actually operates, the sensor continuously collects parameter information and feeds the parameter information back to the upper computer, so that the binding parameter information of the model structure is continuously updated, the model of the lithium battery pole piece rolling mill is driven to continuously move, and the virtual prototype of the lithium battery pole piece rolling mill and the entity of the lithium battery pole piece rolling mill are interconnected;
(4) feedback control lithium battery pole piece rolling mill and fault early warning
When the lithium battery pole piece rolling mill model continuously moves, observing the operation condition of the lithium battery pole piece rolling mill through a simulation platform in ADAMS of an upper computer, dynamically comparing and analyzing the entity of the lithium battery pole piece rolling mill and a virtual prototype of the lithium battery pole piece rolling mill, evaluating and optimizing the control strategy and the operation condition of the lithium battery pole piece rolling mill by the upper computer according to the virtual working condition information and the parameter information acquired by a sensor, and sending information needing to be changed to a main control system; the main control system changes the method and parameters in the main control system software according to the received data, and then drives the driving module to realize the regulation and control of the lithium battery pole piece rolling mill entity; by analyzing the stability of the operation of the lithium battery pole piece rolling mill entity on the simulation platform in the ADAMS and the collected operation parameters, the fault prediction of the lithium battery pole piece rolling mill is carried out on the upper computer, and possible faults are avoided.
2. An intelligent control system of a lithium battery pole piece rolling mill based on a digital twinning technology is suitable for the control method of claim 1, and is characterized by comprising an upper computer, a sensor, a main control system, an information collection module, a driving module and an information transmission module; the information collection module is connected with the sensor through an interface, receives the parameters of tension, gap, pressure, offset distance, speed, thickness and roll diameter collected by the sensor, collects and stores the data of the sensor, and transmits the data to the master control system through the module or transmits the data to the upper computer through the information transmission module;
the sensors comprise a deviation-correcting sensor, a thickness measuring sensor, a tension sensor, a pressure sensor and an encoder, wherein the deviation-correcting sensor and the thickness measuring sensor are arranged at the edge of the lithium battery pole piece;
the deviation rectifying sensor adopts a PS-C2 groove type deviation rectifying sensor; the thickness measuring sensor adopts a ZTMS08 type thickness measuring sensor; the tension sensor adopts a WLF type shaft penetrating type tension sensor; the pressure sensor adopts a Sbarton SBT760 type pressure sensor;
the driving module is connected with a servo motor and a frequency converter which are driven by each part of the lithium battery pole piece rolling mill, receives signals from a master control system, and completes the control of the rotating speed, the direction and the distance of the servo motor, thereby realizing the control of rolling speed, the control of winding and unwinding tension, the control of rolling pressure, the adjustment of gaps, the control of opening and closing of discharge and the control of winding and unwinding deviation correction;
the information transmission module is connected with the upper computer, the main control system and the information collection module, and the module completes data transmission in a data line connection mode and a wireless wifi mode and is used for information transmission and interaction; the information transmission module is connected with the information collection module, and the information of each sensor collected by the information collection module is transmitted to the upper computer through the information transmission module for analysis by the upper computer; meanwhile, the data transmission between the master control system and the upper computer is finished by the module, so that the information transmission efficiency is improved;
the master control system receives the sensor data acquired by the information acquisition module, transmits the sensor data to the upper computer, and completes information transmission and interaction with the upper computer through the data transmission module; the master control system is connected with the driving module, and the motor control of the driving module is completed by transmitting the control information to the driving module; meanwhile, the main control system and a virtual prototype of the lithium battery pole piece rolling mill established in the upper computer complete information interaction, when the control strategy is optimized through the virtual prototype in the upper computer or part of parameters in the control scheme of the lithium battery pole piece rolling mill are changed, the upper computer sends the information to be changed to the main control system in a mode of directly connecting the upper computer through a data line or by means of an information transmission module, and the main control system changes the method and parameters in the software design of the main control system according to the received data so as to drive a driving module to realize the regulation and control of the lithium battery pole piece rolling mill entity;
the upper computer operates the virtual prototype of the lithium battery pole piece rolling mill and processes the parameter information collected by the sensor; the upper computer receives the tension, gap, pressure, offset distance, speed, thickness and coil diameter parameter information of the corresponding position of the lithium battery pole piece rolling mill acquired by the sensor, transmits the parameter information to ADAMS by means of MATLAB, completes data interaction with a virtual prototype of the lithium battery pole piece rolling mill constructed in the ADAMS, binds the model structure corresponding to the lithium battery pole piece rolling mill entity with the parameter information acquired from the part of entity, and continuously acquires the parameter information and feeds the parameter information back to the upper computer when the lithium battery pole piece rolling mill actually runs, so that the continuous update of the binding parameter information of the model structure is realized, the lithium battery pole piece rolling mill model is driven to continuously move, and the interconnection of the virtual prototype of the lithium battery pole piece rolling mill and the lithium battery pole piece rolling mill entity is realized;
an ADAMS simulation platform is arranged in the upper computer, the operation condition of the lithium battery pole piece rolling mill is observed through the ADAMS simulation platform, virtual operation condition information is collected, the lithium battery pole piece rolling mill entity and a virtual prototype of the lithium battery pole piece rolling mill are subjected to dynamic comparative analysis, the control strategy and the operation condition of the lithium battery pole piece rolling mill are evaluated and optimized by the upper computer in combination with the virtual condition information and parameter information collected by a sensor, and information needing to be changed is sent to a main control system; the main control system changes the method and parameters in the main control system software according to the received data, and then drives the driving module to realize the regulation and control of the lithium battery pole piece rolling mill entity; through analyzing the stability of the operation of the lithium battery pole piece rolling mill on the ADAMS simulation platform and the collected operation parameters, the fault prediction of the lithium battery pole piece rolling mill is carried out on the upper computer, and possible faults are avoided.
3. The intelligent control system of a lithium battery pole piece rolling mill based on the digital twin technology as claimed in claim 2, wherein the control unit is composed of a main control system, an information collection module, a driving module and an information transmission module, and is realized in a manner of an embedded development board.
4. The intelligent control system of the lithium battery pole piece rolling mill based on the digital twin technology as claimed in claim 2, wherein the main control system takes an STM32F4 chip as a host chip as a main controller of each module; directly reading out data stored on an SRAM chip by an FPGA chip in an information collection module through an FSMC communication function of an STM32F4 chip; meanwhile, the transmission and feedback of control strategy information and motor running condition information are realized through an RS485 communication interface and a driving module; meanwhile, the master control chip communicates with the upper computer through the information transmission module, transmits the collected information to the upper computer in a wireless or CAN bus mode, and receives the information from the upper computer.
5. The intelligent control system of a lithium battery pole piece rolling mill based on a digital twin technology as claimed in claim 2, wherein the information collection module takes an XC3S400 type FPGA chip as a core, collects sensor information data through the FPGA chip and stores the sensor information data into an externally-hung SRAM chip to complete the collection of sensing information, reads out the data in the SRAM chip through the FPGA chip and transmits the sensing information to an upper computer through an information transmission module, or directly reads out the data on the SRAM chip through the FSMC communication function of an STM32F4 chip of the main control system, and transmits the sensing data to the upper computer through the STM32F4 chip of the main control system.
6. The intelligent control system of the lithium battery pole piece rolling mill based on the digital twin technology as claimed in claim 2, wherein the driving module takes an STM32F4 chip as a core and communicates with a main control system in an RS485 mode to realize interaction of data and information; the master control system transmits the control mode of the servo motor and the frequency converter in the lithium battery pole piece rolling mill to the STM32F4 chip of the driving module in an information mode through the RS485 communication interface, then the driving module controls the servo driver and the frequency converter, control of each module in the lithium battery pole piece rolling mill is achieved, and meanwhile the running condition of the servo motor is fed back to the master control system through the RS485 communication interface.
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| CN113673115B (en) * | 2021-08-31 | 2023-05-16 | 北京航空航天大学 | Lithium battery cycle life prediction and reliability assessment method based on digital twin |
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| CN114630211B (en) * | 2022-05-13 | 2022-08-05 | 苏州氢澜科技有限公司 | Fuel cell production system based on digital twinning and adjusting method thereof |
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